# Percent Error Calculator

> Calculate percent error from an accepted value and an experimental value, with the formula, absolute error, and step by step work for math, chemistry, and physics.

**URL:** https://www.calculatoranswers.com/percent-error-calculator
**Category:** Education

## Quick Answer

Calculate the percentage difference between your experimental measurement and the true, theoretical value. Enter both numbers to see the absolute percent error instantly.

## Definition

A percent error calculator is a scientific utility used to determine the accuracy of an experimental measurement by comparing it to an accepted or theoretical value. It calculates percent error by taking the absolute difference between the experimental value and the theoretical value, dividing that difference by the theoretical value, and multiplying the result by one hundred. The resulting percentage indicates the magnitude of deviation from the true value, with lower percentages representing higher precision. Chemists, physicists, engineers, and students use this calculator to assess experimental precision and analyze source errors in laboratory testing.

## How to Use

1. **Enter experimental value** — Type your measured or observed value from your experiment into the first input field.
2. **Enter theoretical value** — Input the known, accepted, or true value into the second input field.
3. **Read the percent error** — View the calculated absolute percent error percentage along with the formula and subtraction steps.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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